Preheat oven to 350 degrees F (175 degrees C). Grease a 9×13 inch baking pan.
In a large bowl, combine pumpkin, milk, eggs, sugar and spice. Mix well, and pour into a 9×13 inch pan.
Sprinkle dry cake mix over the top, then drizzle with melted butter. Top with walnuts.
Bake at 350 degrees F (175 degrees C) for 1 hour or until a knife inserted near the center comes out clean.
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